[
  {
    "256": {
      "ind1": " ",
      "ind2": " ",
      "subfields": [
        {
          "a": "Computer data (2 files : 800, 1250 records) and programs (3 files : 7260, 3490, 5076 bytes)."
        }
      ]
    }
  }
]

JSON-LD

{
  "mainEntity": {
    "hasNote": [
      {
        "@type": "marc:ComputerFileCharacteristics",
        "label": "Computer data (2 files : 800, 1250 records) and programs (3 files : 7260, 3490, 5076 bytes)."
      }
    ]
  }
}